Installations
Banana plugs are inserted in the ends of the plastic insulating nuts on each output terminal. The terminals are spaced to accept standard 3/4Ó (19 mm) spaced dual banana plugs. Alternately, the insulating nuts may be loosened so that stranded or solid wire may be attached. The threaded posts under the nuts have holes in them which can accept fairly heavy gauge wire, but if the wire does not fit through the hole, it may be wrapped around the post. In either case, the nut should be snugly tightened to secure the wire in place.
Caution: Be sure that no stray wire strands accidentally touch an adjacent wire or terminal. Lightly tinning the end of a stranded wire with solder after the strands are twisted together will help prevent it from fraying and will insure that all strands are connected, but be careful when tightening or stressing the wireÑtinned wires may be brittle.
If a crimp lug terminal is used on the speaker wire and the lug is too small to fit onto the threaded post, one leg of the terminal may be inserted in the hole in the post. As with wire connections, make certain that the terminal is snugly attached by tightening the plastic insulator nut.
A positive voltage applied to the High (+) side of either input when the amplifier is in Stereo mode will result in a positive voltage appearing on the Red (+) terminal of the corresponding output channel.
When connecting the output of the amplifier in Bridged Mono mode (assuming that the input has been connected to Channel A and the Stereo/Mono rear panel switch has been set to Mono), the loudspeaker wires are connected to the two center terminals only. Note that, unlike amplifiers from some other manufacturers, Bridged Mono connections are to Red and Black terminals, not to two Red or two Black terminals. Do not connect anything to either of the two outer terminals.
In Bridged Mono mode, applying a positive voltage to the High (+) side of the Channel A input connection will result in a positive voltage on the Red output terminal (Channel A +).
Note that Channel B of each Matica amplifier is internally inverting, which assures the maximum possible low frequency output when both channels are driven. Connecting the wiring as described above will keep the input to output signal polarity consistent. However, the Black terminals of Channels A and B are not at the same potential and must not be connected together. Some loudspeaker switching systems and many headphones use common wiring for the low sides of both channels; these systems cannot be used with Matica amplifiers unless the alternate wiring instructions below are followed.
Operation with a common output wiring is possible by connecting the black output binding post of the A channel to the red post of the B channel. This is now the common speaker or headphone output lead and is at ground potential. The remaining red and black posts are the Channel A and B "hot" connections respectively.
Next, the audio input to the amplifier must be from a balanced source. Wire the A Channel balanced input wiring with normal polarity but wire the B Channel's input with the Polarity inverted.
Matica 500/900 Reference Manual | 11 |
